Keihin fcr mx flat slide carb swap
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Posts: 4,650
From: Delaware, Ohio
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My bike revs up very well ahead of the AP kick in point; it doesn't seem to be dependent on the AP. So a flat slide carb w/o AP would probably do fine.
It may depend a lot on the gearing that's on a bike/how it's ridden? A high geared sumo SF might need the AP boost more than a tight geared bike that's used off road most of the time.
I'm thinking I may look around for a longer AP kick in adjust screw. The one that comes with these Mikuni pumper carbs doesn't let you adjust the kick in very far away from idle. Mine's running fine as it is, but I'd like more adjustability.
Unless I can just put something under the end of the original screw to have it start lifting the white actuator above the plunger earlier.
It may depend a lot on the gearing that's on a bike/how it's ridden? A high geared sumo SF might need the AP boost more than a tight geared bike that's used off road most of the time.
I'm thinking I may look around for a longer AP kick in adjust screw. The one that comes with these Mikuni pumper carbs doesn't let you adjust the kick in very far away from idle. Mine's running fine as it is, but I'd like more adjustability.
Unless I can just put something under the end of the original screw to have it start lifting the white actuator above the plunger earlier.
Thank you, I may try this avenue just to see what happens if I can get a carb for really low buck. I will have to check dimensions to see what would be needed to fit it between the air box boot and the intake manifold to see what it takes. I'm sure they're short enough to fit in the space given.
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From: SW Ohio
Actually I was commenting about the flat slide w/o the accelerator pump. Seems if the round slide would work well on older Hondas, Yamahas, etc w/o the accelerator pump it brings up the question of how the new flat slides would work. The are often available for around $50 or so. My current and previous SR500s had the round slide since the flat slides weren't predominant yet.
Just curious.
Just curious.
stock vacuum carb
the deal is make sure it will fit,you may have to make or get adapters
but the big thing is getting it jetted right that takes some special gear and a lot of time but yes it is all doable
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Posts: 866
From: SE Asia
I know what ya are talking about I think I have a older flat slide carb sitting around the shop some where, I'm sure it would be a improvement over the
stock vacuum carb
the deal is make sure it will fit,you may have to make or get adapters
but the big thing is getting it jetted right that takes some special gear and a lot of time but yes it is all doable
stock vacuum carb
the deal is make sure it will fit,you may have to make or get adapters
but the big thing is getting it jetted right that takes some special gear and a lot of time but yes it is all doable
Senior Member
1st Gear Member
Joined: Mar 2013
Posts: 866
From: SE Asia
Thank you, I may try this avenue just to see what happens if I can get a carb for really low buck. I will have to check dimensions to see what would be needed to fit it between the air box boot and the intake manifold to see what it takes. I'm sure they're short enough to fit in the space given.
eBay TMX carb
TMX carb dimensions
Mikuni TM sereis dimensions
Mikuni VM series round slide dimensions
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Joined: Nov 2014
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From: SW Ohio
up date
Up date
carb came in I bought a fcr mx 37 off a wr250f
the carb that I got is a 2004/2009 fcr mx 39 off
a yamaha yfz 450
the bike on TT that they put the fcr on is kick start
no way this carb is going to fit my klx it will not clear the electric starter
project now on hold till I can sort this out
carb came in I bought a fcr mx 37 off a wr250f
the carb that I got is a 2004/2009 fcr mx 39 off
a yamaha yfz 450
the bike on TT that they put the fcr on is kick start
no way this carb is going to fit my klx it will not clear the electric starter
project now on hold till I can sort this out
Last edited by 113moro; Nov 8, 2014 at 11:56 AM.
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From: SW Ohio
I like the go button way too much
and it is my wife's bike and she is not into the whole kick start thing
The bike runs great 70 mpg and she loves it
so this may be all for me
and it is my wife's bike and she is not into the whole kick start thing
The bike runs great 70 mpg and she loves it
so this may be all for me
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Posts: 866
From: SE Asia
This guy has an FCR on his KLX250, but I think it's a 34 or 35mm
https://www.kawasakiforums.com/forum...e-issue-35994/
So all FCR carbs come with no choke??
https://www.kawasakiforums.com/forum...e-issue-35994/
So all FCR carbs come with no choke??
Last edited by Richard Avatar; Nov 9, 2014 at 04:09 AM.
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Posts: 70
From: SW Ohio
This guy has an FCR on his KLX250, but I think it's a 34 or 35mm
https://www.kawasakiforums.com/forum...e-issue-35994/
So all FCR carbs come with no choke??
https://www.kawasakiforums.com/forum...e-issue-35994/
So all FCR carbs come with no choke??
they have a choke system
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Posts: 869
From: SW Ontario, Canada
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If somebody decides to try a TMXX, I've done a lot of set up on these carbs, so I may have some useful info. The guys I ride with actually prefer the Kehin PWK over the TMXX for anything other than WOT/MX racing. I have an RB modded TMXX on my Husky that works very well. I also have a spare TMXX, and a 38 Lectron just sitting in a box. Hmm.
